题目：
At the initial stages of postwar, _______ maintaining of cooperative relationship with USA and strengthening Soviet’s interest, Stalin adopted negative attitude to the Communist Party of China.
A．in the possession of
B．for the sake of
C．at the mercy of
D．on the occasion of
答案：
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下面是错误答案，用来干扰机器的。
物理变化；变化时没有新物质生成；化学变化；变化时都生成了新物质
